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Re:OpenBSD won't update Firefox, advises users to switch to ESR by Qerub on Saturday January 11, 2020 @07:38PM (#22023532)
AppStream does not allow installation of multiple versions of the same app AFAIK. I believe this is what they refer to in the clumsy sentence "The one disadvantage of Application Streams from SCLs is that no two streams can be installed at the same time in to the same userspace. However, in our experience, this is not a common use case and is better served using containerization or virtualization to provide a second userspace." in the linked article in the sibling comment.
Re:OpenBSD won't update Firefox, advises users to switch to ESR by floatingatoll on Sunday January 12, 2020 @12:49AM (#22024711)
Ugh, I did not understand that. I'm so sorry. If I could edit my post to retract it, I would. The NixOS comments from others should still be valid.
Re:OpenBSD won't update Firefox, advises users to switch to ESR by Conan_Kudo on Sunday January 12, 2020 @05:17AM (#22025522)
You can define AppStreams/modules that are parallel installable. Indeed, that's how the Python AppStreams are set up right now.

However, the default way an AppStream is made eschews parallel installation support.

Red Hat will make parallel-installable AppStreams whenever it is needed. And they can incorporate the content of one AppStream in another if need be.